git_etc: create etc if it doesn't exist.
ffmpeg 2.0.2
libvpx: fix checksum.

Closes #23221.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
chicken 4.8.0.5

Closes #23222.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>